.itop {
		display: none;
		margin-bottom: 5px;
		width: 40px;
		height: 36px;
		border-radius: 2px;
		background: url(./to-top.png) 8px 6px no-repeat;
		background-color: #444;
		background-color: rgba(0, 0, 0, .6);
		cursor: pointer;
		box-shadow: 0 1px 3px rgba(0, 0, 0, .2);
	}